Inflatable umbrella



FIG. 1 is a perspective view of the claimed design.

FIG. 2 is a side view of the claimed design.

FIG. 3 is another side view of the claimed design; and,

FIG. 4 is a bottom view of the claimed design.

The broken lines are shown for the purpose of illustrating unclaimed portions of the inflatable umbrella and form no part of the claimed design. 

CLAIM The ornamental design for an inflatable umbrella, as shown and described. 